drivers/adc/adc_mcux_lpadc.c - third_party/github/zephyrproject-rtos/zephyr - Git at Google

 /*
  * Copyright (c) 2020 Toby Firth
  *
  * Based on adc_mcux_adc16.c and adc_mcux_adc12.c, which are:
  * Copyright (c) 2017-2018, NXP
  * Copyright (c) 2019 Vestas Wind Systems A/S
  *
  * SPDX-License-Identifier: Apache-2.0
  */

 #define DT_DRV_COMPAT nxp_lpc_lpadc

 #include <errno.h>
 #include <zephyr/drivers/adc.h>
 #include <fsl_lpadc.h>

 #if CONFIG_PINCTRL
 #include <zephyr/drivers/pinctrl.h>
 #endif

 #if !defined(CONFIG_SOC_SERIES_IMX_RT11XX)
 #include <fsl_power.h>
 #endif

 #define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
 #include <zephyr/logging/log.h>
 LOG_MODULE_REGISTER(nxp_mcux_lpadc);

 #define ADC_CONTEXT_USES_KERNEL_TIMER
 #include "adc_context.h"


 struct mcux_lpadc_config {
 	ADC_Type *base;
 	uint32_t clock_div;
 	uint32_t clock_source;
 	lpadc_reference_voltage_source_t voltage_ref;
 #if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS)\
 	&& FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
 	lpadc_conversion_average_mode_t calibration_average;
 #else
 	uint32_t calibration_average;
 #endif /* FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS */
 	lpadc_power_level_mode_t power_level;
 	uint32_t offset_a;
 	uint32_t offset_b;
 	void (*irq_config_func)(const struct device *dev);
 #if CONFIG_PINCTRL
 	const struct pinctrl_dev_config *pincfg;
 #endif
 };

 struct mcux_lpadc_data {
 	const struct device *dev;
 	struct adc_context ctx;
 	uint16_t *buffer;
 	uint16_t *repeat_buffer;
 	uint32_t channels;
 	uint8_t channel_id;
 	lpadc_hardware_average_mode_t average;
 #if defined(FSL_FEATURE_LPADC_HAS_CMDL_MODE) \
 	&& FSL_FEATURE_LPADC_HAS_CMDL_MODE
 	lpadc_conversion_resolution_mode_t resolution;
 #endif /* FSL_FEATURE_LPADC_HAS_CMDL_MODE */
 };

 static int mcux_lpadc_channel_setup(const struct device *dev,
 				const struct adc_channel_cfg *channel_cfg)
 {
 	uint8_t channel_id = channel_cfg->channel_id;

 	if (channel_id > 31) {
 		LOG_ERR("Channel %d is not valid", channel_id);
 		return -EINVAL;
 	}

 	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
 		LOG_ERR("Invalid channel acquisition time");
 		return -EINVAL;
 	}

 	if (channel_cfg->differential) {
 		LOG_ERR("Differential channels are not supported");
 		return -EINVAL;
 	}

 	if (channel_cfg->gain != ADC_GAIN_1) {
 		LOG_ERR("Invalid channel gain");
 		return -EINVAL;
 	}

 	if (channel_cfg->reference != ADC_REF_EXTERNAL0) {
 		LOG_ERR("Invalid channel reference");
 		return -EINVAL;
 	}

 	return 0;
 }

 static int mcux_lpadc_start_read(const struct device *dev,
 		 const struct adc_sequence *sequence)
 {
 	struct mcux_lpadc_data *data = dev->data;
 #if defined(FSL_FEATURE_LPADC_HAS_CMDL_MODE) \
 	&& FSL_FEATURE_LPADC_HAS_CMDL_MODE
 	switch (sequence->resolution) {
 	case 12:
 	case 13:
 		data->resolution = kLPADC_ConversionResolutionStandard;
 		break;
 	case 16:
 		data->resolution = kLPADC_ConversionResolutionHigh;
 		break;
 	default:
 		LOG_ERR("Unsupported resolution %d", sequence->resolution);
 		return -ENOTSUP;
 	}
 #else
 	/* If FSL_FEATURE_LPADC_HAS_CMDL_MODE is not defined
 	   only 12/13 bit resolution is supported. */
 	if (sequence->resolution != 12 && sequence->resolution != 13) {
 		LOG_ERR("Unsupported resolution %d", sequence->resolution);
 		return -ENOTSUP;
 	}
 #endif /* FSL_FEATURE_LPADC_HAS_CMDL_MODE */

 	switch (sequence->oversampling) {
 	case 0:
 		data->average = kLPADC_HardwareAverageCount1;
 		break;
 	case 1:
 		data->average = kLPADC_HardwareAverageCount2;
 		break;
 	case 2:
 		data->average = kLPADC_HardwareAverageCount4;
 		break;
 	case 3:
 		data->average = kLPADC_HardwareAverageCount8;
 		break;
 	case 4:
 		data->average = kLPADC_HardwareAverageCount16;
 		break;
 	case 5:
 		data->average = kLPADC_HardwareAverageCount32;
 		break;
 	case 6:
 		data->average = kLPADC_HardwareAverageCount64;
 		break;
 	case 7:
 		data->average = kLPADC_HardwareAverageCount128;
 		break;
 	default:
 		LOG_ERR("Unsupported oversampling value %d",
 			sequence->oversampling);
 		return -ENOTSUP;
 	}

 	data->buffer = sequence->buffer;

 	adc_context_start_read(&data->ctx, sequence);
 	int error = adc_context_wait_for_completion(&data->ctx);

 	return error;
 }

 static int mcux_lpadc_read_async(const struct device *dev,
 			const struct adc_sequence *sequence,
 			struct k_poll_signal *async)
 {
 	struct mcux_lpadc_data *data = dev->data;
 	int error;

 	adc_context_lock(&data->ctx, async ? true : false, async);
 	error = mcux_lpadc_start_read(dev, sequence);
 	adc_context_release(&data->ctx, error);

 	return error;
 }

 static int mcux_lpadc_read(const struct device *dev,
 		   const struct adc_sequence *sequence)
 {
 	return mcux_lpadc_read_async(dev, sequence, NULL);
 }

 static void mcux_lpadc_start_channel(const struct device *dev)
 {
 	const struct mcux_lpadc_config *config = dev->config;
 	struct mcux_lpadc_data *data = dev->data;

 	data->channel_id = find_lsb_set(data->channels) - 1;

 	LOG_DBG("Starting channel %d", data->channel_id);

 	lpadc_conv_command_config_t cmd_config;

 	LPADC_GetDefaultConvCommandConfig(&cmd_config);
 	cmd_config.channelNumber = data->channel_id;
 #if defined(FSL_FEATURE_LPADC_HAS_CMDL_MODE) \
 	&& FSL_FEATURE_LPADC_HAS_CMDL_MODE
 	cmd_config.conversionResolutionMode = data->resolution;
 #endif /* FSL_FEATURE_LPADC_HAS_CMDL_MODE */
 	cmd_config.hardwareAverageMode = data->average;
 	LPADC_SetConvCommandConfig(config->base, 1, &cmd_config);

 	lpadc_conv_trigger_config_t trigger_config;

 	LPADC_GetDefaultConvTriggerConfig(&trigger_config);

 	trigger_config.targetCommandId = 1;

 	/* configures trigger0. */
 	LPADC_SetConvTriggerConfig(config->base, 0, &trigger_config);

 	/* 1 is trigger0 mask. */
 	LPADC_DoSoftwareTrigger(config->base, 1);
 }

 static void adc_context_start_sampling(struct adc_context *ctx)
 {
 	struct mcux_lpadc_data *data =
 	CONTAINER_OF(ctx, struct mcux_lpadc_data, ctx);

 	data->channels = ctx->sequence.channels;
 	data->repeat_buffer = data->buffer;

 	mcux_lpadc_start_channel(data->dev);
 }

 static void adc_context_update_buffer_pointer(struct adc_context *ctx,
 			  bool repeat_sampling)
 {
 	struct mcux_lpadc_data *data =
 		CONTAINER_OF(ctx, struct mcux_lpadc_data, ctx);

 	if (repeat_sampling) {
 		data->buffer = data->repeat_buffer;
 	}
 }

 static void mcux_lpadc_isr(const struct device *dev)
 {
 	const struct mcux_lpadc_config *config = dev->config;
 	struct mcux_lpadc_data *data = dev->data;
 	ADC_Type *base = config->base;

 	lpadc_conv_result_t conv_result;

 #if (defined(FSL_FEATURE_LPADC_FIFO_COUNT) \
 	&& (FSL_FEATURE_LPADC_FIFO_COUNT == 2U))
 	LPADC_GetConvResult(base, &conv_result, 0U);
 #else
 	LPADC_GetConvResult(base, &conv_result);
 #endif /* FSL_FEATURE_LPADC_FIFO_COUNT */

 	/* For 12-bit resolution the MSB will be 0.
 	   So a 3 bit shift is also needed. */
 	uint16_t result = data->ctx.sequence.resolution < 16 ?
 			conv_result.convValue >> 3 : conv_result.convValue;

 	LOG_DBG("Finished channel %d. Result is 0x%04x",
 		data->channel_id, result);

 	*data->buffer++ = result;

 	data->channels &= ~BIT(data->channel_id);

 	if (data->channels) {
 		mcux_lpadc_start_channel(dev);
 	} else {
 		adc_context_on_sampling_done(&data->ctx, dev);
 	}
 }

 static int mcux_lpadc_init(const struct device *dev)
 {
 	const struct mcux_lpadc_config *config = dev->config;
 	struct mcux_lpadc_data *data = dev->data;
 	ADC_Type *base = config->base;
 	lpadc_config_t adc_config;
 #ifdef CONFIG_PINCTRL
 	int err;

 	err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
 	if (err) {
 		return err;
 	}
 #endif

 #if !defined(CONFIG_SOC_SERIES_IMX_RT11XX)
 #if	defined(CONFIG_SOC_SERIES_IMX_RT6XX)

 	SYSCTL0->PDRUNCFG0_CLR = SYSCTL0_PDRUNCFG0_ADC_PD_MASK;
 	SYSCTL0->PDRUNCFG0_CLR = SYSCTL0_PDRUNCFG0_ADC_LP_MASK;
 	RESET_PeripheralReset(kADC0_RST_SHIFT_RSTn);
 	CLOCK_AttachClk(kSFRO_to_ADC_CLK);
 	CLOCK_SetClkDiv(kCLOCK_DivAdcClk, config->clock_div);

 #else

 	CLOCK_SetClkDiv(kCLOCK_DivAdcAsyncClk, config->clock_div, true);
 	CLOCK_AttachClk(config->clock_source);

 	/* Power up the ADC */
 	POWER_DisablePD(kPDRUNCFG_PD_LDOGPADC);

 #endif
 #endif

 	LPADC_GetDefaultConfig(&adc_config);

 	adc_config.enableAnalogPreliminary = true;
 	adc_config.referenceVoltageSource = config->voltage_ref;

 #if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS) \
 	&& FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
 	adc_config.conversionAverageMode = config->calibration_average;
 #endif /* FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS */

 	adc_config.powerLevelMode = config->power_level;

 	LPADC_Init(base, &adc_config);

 	/* Do ADC calibration. */
 #if defined(FSL_FEATURE_LPADC_HAS_CTRL_CALOFS) \
 	&& FSL_FEATURE_LPADC_HAS_CTRL_CALOFS
 #if defined(FSL_FEATURE_LPADC_HAS_OFSTRIM) \
 	&& FSL_FEATURE_LPADC_HAS_OFSTRIM
 	/* Request offset calibration. */
 #if defined(CONFIG_LPADC_DO_OFFSET_CALIBRATION) \
 	&& CONFIG_LPADC_DO_OFFSET_CALIBRATION
 	LPADC_DoOffsetCalibration(base);
 #else
 	LPADC_SetOffsetValue(base,
 			config->offset_a,
 			config->offset_b);
 #endif  /* DEMO_LPADC_DO_OFFSET_CALIBRATION */
 #endif  /* FSL_FEATURE_LPADC_HAS_OFSTRIM */
 	/* Request gain calibration. */
 	LPADC_DoAutoCalibration(base);
 #endif /* FSL_FEATURE_LPADC_HAS_CTRL_CALOFS */

 #if (defined(FSL_FEATURE_LPADC_HAS_CFG_CALOFS) \
 	&& FSL_FEATURE_LPADC_HAS_CFG_CALOFS)
 	/* Do auto calibration. */
 	LPADC_DoAutoCalibration(base);
 #endif /* FSL_FEATURE_LPADC_HAS_CFG_CALOFS */

 /* Enable the watermark interrupt. */
 #if (defined(FSL_FEATURE_LPADC_FIFO_COUNT) \
 	&& (FSL_FEATURE_LPADC_FIFO_COUNT == 2U))
 	LPADC_EnableInterrupts(base, kLPADC_FIFO0WatermarkInterruptEnable);
 #else
 	LPADC_EnableInterrupts(base, kLPADC_FIFOWatermarkInterruptEnable);
 #endif /* FSL_FEATURE_LPADC_FIFO_COUNT */

 	config->irq_config_func(dev);
 	data->dev = dev;

 	adc_context_unlock_unconditionally(&data->ctx);

 	return 0;
 }

 static const struct adc_driver_api mcux_lpadc_driver_api = {
 	.channel_setup = mcux_lpadc_channel_setup,
 	.read = mcux_lpadc_read,
 #ifdef CONFIG_ADC_ASYNC
 	.read_async = mcux_lpadc_read_async,
 #endif
 };


 #define ASSERT_LPADC_CLK_SOURCE_VALID(val, str)	\
 	BUILD_ASSERT(val == 0 || val == 1 || val == 2 || val == 7, str)

 #define ASSERT_LPADC_CLK_DIV_VALID(val, str) \
 	BUILD_ASSERT(val == 1 || val == 2 || val == 4 || val == 8, str)

 #define ASSERT_LPADC_CALIBRATION_AVERAGE_VALID(val, str) \
 	BUILD_ASSERT(val == 1 || val == 2 || val == 4 || val == 8 \
 		|| val == 16 || val == 32 || val == 64 || val == 128, str) \

 #define ASSERT_WITHIN_RANGE(val, min, max, str)	\
 	BUILD_ASSERT(val >= min && val <= max, str)

 #if defined(CONFIG_SOC_SERIES_IMX_RT11XX) || defined(CONFIG_SOC_SERIES_IMX_RT6XX)
 #define TO_LPADC_CLOCK_SOURCE(val) 0
 #else
 #define TO_LPADC_CLOCK_SOURCE(val) \
 	MUX_A(CM_ADCASYNCCLKSEL, val)
 #endif

 #define TO_LPADC_REFERENCE_VOLTAGE(val) \
 	_DO_CONCAT(kLPADC_ReferenceVoltageAlt, val)

 #if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS)\
 	&& FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
 #define TO_LPADC_CALIBRATION_AVERAGE(val) \
 	_DO_CONCAT(kLPADC_ConversionAverage, val)
 #else
 #define TO_LPADC_CALIBRATION_AVERAGE(val) 0
 #endif

 #define TO_LPADC_POWER_LEVEL(val) \
 	_DO_CONCAT(kLPADC_PowerLevelAlt, val)

 #if CONFIG_PINCTRL
 #define PINCTRL_DEFINE(n) PINCTRL_DT_INST_DEFINE(n);
 #define PINCTRL_INIT(n) .pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),
 #else
 #define PINCTRL_DEFINE(n)
 #define PINCTRL_INIT(n)
 #endif /* CONFIG_PINCTRL */

 #define LPADC_MCUX_INIT(n)						\
 	static void mcux_lpadc_config_func_##n(const struct device *dev);	\
 									\
 	ASSERT_LPADC_CLK_SOURCE_VALID(DT_INST_PROP(n, clk_source),	\
 			  "Invalid clock source");			\
 	ASSERT_LPADC_CLK_DIV_VALID(DT_INST_PROP(n, clk_divider),	\
 		   "Invalid clock divider");			\
 	ASSERT_WITHIN_RANGE(DT_INST_PROP(n, voltage_ref), 2, 3,	\
 		"Invalid voltage reference source");	\
 	ASSERT_LPADC_CALIBRATION_AVERAGE_VALID(		\
 		DT_INST_PROP(n, calibration_average),	\
 		"Invalid conversion average number for auto-calibration time");	\
 	ASSERT_WITHIN_RANGE(DT_INST_PROP(n, power_level), 1, 4,		\
 		"Invalid power level");					\
 	PINCTRL_DEFINE(n)						\
 	static const struct mcux_lpadc_config mcux_lpadc_config_##n = {	\
 		.base = (ADC_Type *)DT_INST_REG_ADDR(n),	\
 		.clock_source = TO_LPADC_CLOCK_SOURCE(DT_INST_PROP(n, clk_source)),	\
 		.clock_div = DT_INST_PROP(n, clk_divider),					\
 		.voltage_ref =												\
 			TO_LPADC_REFERENCE_VOLTAGE(DT_INST_PROP(n, voltage_ref)),	\
 		.calibration_average =										\
 			TO_LPADC_CALIBRATION_AVERAGE(DT_INST_PROP(n, calibration_average)),	\
 		.power_level = TO_LPADC_POWER_LEVEL(DT_INST_PROP(n, power_level)),	\
 		.offset_a = DT_INST_PROP(n, offset_value_a),	\
 		.offset_a = DT_INST_PROP(n, offset_value_b),	\
 		.irq_config_func = mcux_lpadc_config_func_##n,				\
 		PINCTRL_INIT(n)					\
 	};									\
 										\
 	static struct mcux_lpadc_data mcux_lpadc_data_##n = {	\
 		ADC_CONTEXT_INIT_TIMER(mcux_lpadc_data_##n, ctx),	\
 		ADC_CONTEXT_INIT_LOCK(mcux_lpadc_data_##n, ctx),	\
 		ADC_CONTEXT_INIT_SYNC(mcux_lpadc_data_##n, ctx),	\
 	};														\
 										\
 	DEVICE_DT_INST_DEFINE(n,						\
 		&mcux_lpadc_init, NULL, &mcux_lpadc_data_##n,			\
 		&mcux_lpadc_config_##n, POST_KERNEL,				\
 		CONFIG_ADC_INIT_PRIORITY,					\
 		&mcux_lpadc_driver_api);							\
 										\
 	static void mcux_lpadc_config_func_##n(const struct device *dev)	\
 	{									\
 		IRQ_CONNECT(DT_INST_IRQN(n),					\
 			DT_INST_IRQ(n, priority), mcux_lpadc_isr,	\
 			DEVICE_DT_INST_GET(n), 0);				\
 										\
 		irq_enable(DT_INST_IRQN(n));					\
 	}

 DT_INST_FOREACH_STATUS_OKAY(LPADC_MCUX_INIT)
	/*
	* Copyright (c) 2020 Toby Firth
	*
	* Based on adc_mcux_adc16.c and adc_mcux_adc12.c, which are:
	* Copyright (c) 2017-2018, NXP
	* Copyright (c) 2019 Vestas Wind Systems A/S
	*
	* SPDX-License-Identifier: Apache-2.0
	*/

	#define DT_DRV_COMPAT nxp_lpc_lpadc

	#include <errno.h>
	#include <zephyr/drivers/adc.h>
	#include <fsl_lpadc.h>

	#if CONFIG_PINCTRL
	#include <zephyr/drivers/pinctrl.h>
	#endif

	#if !defined(CONFIG_SOC_SERIES_IMX_RT11XX)
	#include <fsl_power.h>
	#endif

	#define LOG_LEVEL CONFIG_ADC_LOG_LEVEL
	#include <zephyr/logging/log.h>
	LOG_MODULE_REGISTER(nxp_mcux_lpadc);

	#define ADC_CONTEXT_USES_KERNEL_TIMER
	#include "adc_context.h"


	struct mcux_lpadc_config {
	ADC_Type *base;
	uint32_t clock_div;
	uint32_t clock_source;
	lpadc_reference_voltage_source_t voltage_ref;
	#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS)\
	&& FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
	lpadc_conversion_average_mode_t calibration_average;
	#else
	uint32_t calibration_average;
	#endif /* FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS */
	lpadc_power_level_mode_t power_level;
	uint32_t offset_a;
	uint32_t offset_b;
	void (irq_config_func)(const struct device dev);
	#if CONFIG_PINCTRL
	const struct pinctrl_dev_config *pincfg;
	#endif
	};

	struct mcux_lpadc_data {
	const struct device *dev;
	struct adc_context ctx;
	uint16_t *buffer;
	uint16_t *repeat_buffer;
	uint32_t channels;
	uint8_t channel_id;
	lpadc_hardware_average_mode_t average;
	#if defined(FSL_FEATURE_LPADC_HAS_CMDL_MODE) \
	&& FSL_FEATURE_LPADC_HAS_CMDL_MODE
	lpadc_conversion_resolution_mode_t resolution;
	#endif /* FSL_FEATURE_LPADC_HAS_CMDL_MODE */
	};

	static int mcux_lpadc_channel_setup(const struct device *dev,
	const struct adc_channel_cfg *channel_cfg)
	{
	uint8_t channel_id = channel_cfg->channel_id;

	if (channel_id > 31) {
	LOG_ERR("Channel %d is not valid", channel_id);
	return -EINVAL;
	}

	if (channel_cfg->acquisition_time != ADC_ACQ_TIME_DEFAULT) {
	LOG_ERR("Invalid channel acquisition time");
	return -EINVAL;
	}

	if (channel_cfg->differential) {
	LOG_ERR("Differential channels are not supported");
	return -EINVAL;
	}

	if (channel_cfg->gain != ADC_GAIN_1) {
	LOG_ERR("Invalid channel gain");
	return -EINVAL;
	}

	if (channel_cfg->reference != ADC_REF_EXTERNAL0) {
	LOG_ERR("Invalid channel reference");
	return -EINVAL;
	}

	return 0;
	}

	static int mcux_lpadc_start_read(const struct device *dev,
	const struct adc_sequence *sequence)
	{
	struct mcux_lpadc_data *data = dev->data;
	#if defined(FSL_FEATURE_LPADC_HAS_CMDL_MODE) \
	&& FSL_FEATURE_LPADC_HAS_CMDL_MODE
	switch (sequence->resolution) {
	case 12:
	case 13:
	data->resolution = kLPADC_ConversionResolutionStandard;
	break;
	case 16:
	data->resolution = kLPADC_ConversionResolutionHigh;
	break;
	default:
	LOG_ERR("Unsupported resolution %d", sequence->resolution);
	return -ENOTSUP;
	}
	#else
	/* If FSL_FEATURE_LPADC_HAS_CMDL_MODE is not defined
	only 12/13 bit resolution is supported. */
	if (sequence->resolution != 12 && sequence->resolution != 13) {
	LOG_ERR("Unsupported resolution %d", sequence->resolution);
	return -ENOTSUP;
	}
	#endif /* FSL_FEATURE_LPADC_HAS_CMDL_MODE */

	switch (sequence->oversampling) {
	case 0:
	data->average = kLPADC_HardwareAverageCount1;
	break;
	case 1:
	data->average = kLPADC_HardwareAverageCount2;
	break;
	case 2:
	data->average = kLPADC_HardwareAverageCount4;
	break;
	case 3:
	data->average = kLPADC_HardwareAverageCount8;
	break;
	case 4:
	data->average = kLPADC_HardwareAverageCount16;
	break;
	case 5:
	data->average = kLPADC_HardwareAverageCount32;
	break;
	case 6:
	data->average = kLPADC_HardwareAverageCount64;
	break;
	case 7:
	data->average = kLPADC_HardwareAverageCount128;
	break;
	default:
	LOG_ERR("Unsupported oversampling value %d",
	sequence->oversampling);
	return -ENOTSUP;
	}

	data->buffer = sequence->buffer;

	adc_context_start_read(&data->ctx, sequence);
	int error = adc_context_wait_for_completion(&data->ctx);

	return error;
	}

	static int mcux_lpadc_read_async(const struct device *dev,
	const struct adc_sequence *sequence,
	struct k_poll_signal *async)
	{
	struct mcux_lpadc_data *data = dev->data;
	int error;

	adc_context_lock(&data->ctx, async ? true : false, async);
	error = mcux_lpadc_start_read(dev, sequence);
	adc_context_release(&data->ctx, error);

	return error;
	}

	static int mcux_lpadc_read(const struct device *dev,
	const struct adc_sequence *sequence)
	{
	return mcux_lpadc_read_async(dev, sequence, NULL);
	}

	static void mcux_lpadc_start_channel(const struct device *dev)
	{
	const struct mcux_lpadc_config *config = dev->config;
	struct mcux_lpadc_data *data = dev->data;

	data->channel_id = find_lsb_set(data->channels) - 1;

	LOG_DBG("Starting channel %d", data->channel_id);

	lpadc_conv_command_config_t cmd_config;

	LPADC_GetDefaultConvCommandConfig(&cmd_config);
	cmd_config.channelNumber = data->channel_id;
	#if defined(FSL_FEATURE_LPADC_HAS_CMDL_MODE) \
	&& FSL_FEATURE_LPADC_HAS_CMDL_MODE
	cmd_config.conversionResolutionMode = data->resolution;
	#endif /* FSL_FEATURE_LPADC_HAS_CMDL_MODE */
	cmd_config.hardwareAverageMode = data->average;
	LPADC_SetConvCommandConfig(config->base, 1, &cmd_config);

	lpadc_conv_trigger_config_t trigger_config;

	LPADC_GetDefaultConvTriggerConfig(&trigger_config);

	trigger_config.targetCommandId = 1;

	/* configures trigger0. */
	LPADC_SetConvTriggerConfig(config->base, 0, &trigger_config);

	/* 1 is trigger0 mask. */
	LPADC_DoSoftwareTrigger(config->base, 1);
	}

	static void adc_context_start_sampling(struct adc_context *ctx)
	{
	struct mcux_lpadc_data *data =
	CONTAINER_OF(ctx, struct mcux_lpadc_data, ctx);

	data->channels = ctx->sequence.channels;
	data->repeat_buffer = data->buffer;

	mcux_lpadc_start_channel(data->dev);
	}

	static void adc_context_update_buffer_pointer(struct adc_context *ctx,
	bool repeat_sampling)
	{
	struct mcux_lpadc_data *data =
	CONTAINER_OF(ctx, struct mcux_lpadc_data, ctx);

	if (repeat_sampling) {
	data->buffer = data->repeat_buffer;
	}
	}

	static void mcux_lpadc_isr(const struct device *dev)
	{
	const struct mcux_lpadc_config *config = dev->config;
	struct mcux_lpadc_data *data = dev->data;
	ADC_Type *base = config->base;

	lpadc_conv_result_t conv_result;

	#if (defined(FSL_FEATURE_LPADC_FIFO_COUNT) \
	&& (FSL_FEATURE_LPADC_FIFO_COUNT == 2U))
	LPADC_GetConvResult(base, &conv_result, 0U);
	#else
	LPADC_GetConvResult(base, &conv_result);
	#endif /* FSL_FEATURE_LPADC_FIFO_COUNT */

	/* For 12-bit resolution the MSB will be 0.
	So a 3 bit shift is also needed. */
	uint16_t result = data->ctx.sequence.resolution < 16 ?
	conv_result.convValue >> 3 : conv_result.convValue;

	LOG_DBG("Finished channel %d. Result is 0x%04x",
	data->channel_id, result);

	*data->buffer++ = result;

	data->channels &= ~BIT(data->channel_id);

	if (data->channels) {
	mcux_lpadc_start_channel(dev);
	} else {
	adc_context_on_sampling_done(&data->ctx, dev);
	}
	}

	static int mcux_lpadc_init(const struct device *dev)
	{
	const struct mcux_lpadc_config *config = dev->config;
	struct mcux_lpadc_data *data = dev->data;
	ADC_Type *base = config->base;
	lpadc_config_t adc_config;
	#ifdef CONFIG_PINCTRL
	int err;

	err = pinctrl_apply_state(config->pincfg, PINCTRL_STATE_DEFAULT);
	if (err) {
	return err;
	}
	#endif

	#if !defined(CONFIG_SOC_SERIES_IMX_RT11XX)
	#if defined(CONFIG_SOC_SERIES_IMX_RT6XX)

	SYSCTL0->PDRUNCFG0_CLR = SYSCTL0_PDRUNCFG0_ADC_PD_MASK;
	SYSCTL0->PDRUNCFG0_CLR = SYSCTL0_PDRUNCFG0_ADC_LP_MASK;
	RESET_PeripheralReset(kADC0_RST_SHIFT_RSTn);
	CLOCK_AttachClk(kSFRO_to_ADC_CLK);
	CLOCK_SetClkDiv(kCLOCK_DivAdcClk, config->clock_div);

	#else

	CLOCK_SetClkDiv(kCLOCK_DivAdcAsyncClk, config->clock_div, true);
	CLOCK_AttachClk(config->clock_source);

	/* Power up the ADC */
	POWER_DisablePD(kPDRUNCFG_PD_LDOGPADC);

	#endif
	#endif

	LPADC_GetDefaultConfig(&adc_config);

	adc_config.enableAnalogPreliminary = true;
	adc_config.referenceVoltageSource = config->voltage_ref;

	#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS) \
	&& FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
	adc_config.conversionAverageMode = config->calibration_average;
	#endif /* FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS */

	adc_config.powerLevelMode = config->power_level;

	LPADC_Init(base, &adc_config);

	/* Do ADC calibration. */
	#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CALOFS) \
	&& FSL_FEATURE_LPADC_HAS_CTRL_CALOFS
	#if defined(FSL_FEATURE_LPADC_HAS_OFSTRIM) \
	&& FSL_FEATURE_LPADC_HAS_OFSTRIM
	/* Request offset calibration. */
	#if defined(CONFIG_LPADC_DO_OFFSET_CALIBRATION) \
	&& CONFIG_LPADC_DO_OFFSET_CALIBRATION
	LPADC_DoOffsetCalibration(base);
	#else
	LPADC_SetOffsetValue(base,
	config->offset_a,
	config->offset_b);
	#endif /* DEMO_LPADC_DO_OFFSET_CALIBRATION */
	#endif /* FSL_FEATURE_LPADC_HAS_OFSTRIM */
	/* Request gain calibration. */
	LPADC_DoAutoCalibration(base);
	#endif /* FSL_FEATURE_LPADC_HAS_CTRL_CALOFS */

	#if (defined(FSL_FEATURE_LPADC_HAS_CFG_CALOFS) \
	&& FSL_FEATURE_LPADC_HAS_CFG_CALOFS)
	/* Do auto calibration. */
	LPADC_DoAutoCalibration(base);
	#endif /* FSL_FEATURE_LPADC_HAS_CFG_CALOFS */

	/* Enable the watermark interrupt. */
	#if (defined(FSL_FEATURE_LPADC_FIFO_COUNT) \
	&& (FSL_FEATURE_LPADC_FIFO_COUNT == 2U))
	LPADC_EnableInterrupts(base, kLPADC_FIFO0WatermarkInterruptEnable);
	#else
	LPADC_EnableInterrupts(base, kLPADC_FIFOWatermarkInterruptEnable);
	#endif /* FSL_FEATURE_LPADC_FIFO_COUNT */

	config->irq_config_func(dev);
	data->dev = dev;

	adc_context_unlock_unconditionally(&data->ctx);

	return 0;
	}

	static const struct adc_driver_api mcux_lpadc_driver_api = {
	.channel_setup = mcux_lpadc_channel_setup,
	.read = mcux_lpadc_read,
	#ifdef CONFIG_ADC_ASYNC
	.read_async = mcux_lpadc_read_async,
	#endif
	};


	#define ASSERT_LPADC_CLK_SOURCE_VALID(val, str) \
	BUILD_ASSERT(val == 0 \|\| val == 1 \|\| val == 2 \|\| val == 7, str)

	#define ASSERT_LPADC_CLK_DIV_VALID(val, str) \
	BUILD_ASSERT(val == 1 \|\| val == 2 \|\| val == 4 \|\| val == 8, str)

	#define ASSERT_LPADC_CALIBRATION_AVERAGE_VALID(val, str) \
	BUILD_ASSERT(val == 1 \|\| val == 2 \|\| val == 4 \|\| val == 8 \
	\|\| val == 16 \|\| val == 32 \|\| val == 64 \|\| val == 128, str) \

	#define ASSERT_WITHIN_RANGE(val, min, max, str) \
	BUILD_ASSERT(val >= min && val <= max, str)

	#if defined(CONFIG_SOC_SERIES_IMX_RT11XX) \|\| defined(CONFIG_SOC_SERIES_IMX_RT6XX)
	#define TO_LPADC_CLOCK_SOURCE(val) 0
	#else
	#define TO_LPADC_CLOCK_SOURCE(val) \
	MUX_A(CM_ADCASYNCCLKSEL, val)
	#endif

	#define TO_LPADC_REFERENCE_VOLTAGE(val) \
	_DO_CONCAT(kLPADC_ReferenceVoltageAlt, val)

	#if defined(FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS)\
	&& FSL_FEATURE_LPADC_HAS_CTRL_CAL_AVGS
	#define TO_LPADC_CALIBRATION_AVERAGE(val) \
	_DO_CONCAT(kLPADC_ConversionAverage, val)
	#else
	#define TO_LPADC_CALIBRATION_AVERAGE(val) 0
	#endif

	#define TO_LPADC_POWER_LEVEL(val) \
	_DO_CONCAT(kLPADC_PowerLevelAlt, val)

	#if CONFIG_PINCTRL
	#define PINCTRL_DEFINE(n) PINCTRL_DT_INST_DEFINE(n);
	#define PINCTRL_INIT(n) .pincfg = PINCTRL_DT_INST_DEV_CONFIG_GET(n),
	#else
	#define PINCTRL_DEFINE(n)
	#define PINCTRL_INIT(n)
	#endif /* CONFIG_PINCTRL */

	#define LPADC_MCUX_INIT(n) \
	static void mcux_lpadc_config_func_##n(const struct device *dev); \
	\
	ASSERT_LPADC_CLK_SOURCE_VALID(DT_INST_PROP(n, clk_source), \
	"Invalid clock source"); \
	ASSERT_LPADC_CLK_DIV_VALID(DT_INST_PROP(n, clk_divider), \
	"Invalid clock divider"); \
	ASSERT_WITHIN_RANGE(DT_INST_PROP(n, voltage_ref), 2, 3, \
	"Invalid voltage reference source"); \
	ASSERT_LPADC_CALIBRATION_AVERAGE_VALID( \
	DT_INST_PROP(n, calibration_average), \
	"Invalid conversion average number for auto-calibration time"); \
	ASSERT_WITHIN_RANGE(DT_INST_PROP(n, power_level), 1, 4, \
	"Invalid power level"); \
	PINCTRL_DEFINE(n) \
	static const struct mcux_lpadc_config mcux_lpadc_config_##n = { \
	.base = (ADC_Type *)DT_INST_REG_ADDR(n), \
	.clock_source = TO_LPADC_CLOCK_SOURCE(DT_INST_PROP(n, clk_source)), \
	.clock_div = DT_INST_PROP(n, clk_divider), \
	.voltage_ref = \
	TO_LPADC_REFERENCE_VOLTAGE(DT_INST_PROP(n, voltage_ref)), \
	.calibration_average = \
	TO_LPADC_CALIBRATION_AVERAGE(DT_INST_PROP(n, calibration_average)), \
	.power_level = TO_LPADC_POWER_LEVEL(DT_INST_PROP(n, power_level)), \
	.offset_a = DT_INST_PROP(n, offset_value_a), \
	.offset_a = DT_INST_PROP(n, offset_value_b), \
	.irq_config_func = mcux_lpadc_config_func_##n, \
	PINCTRL_INIT(n) \
	}; \
	\
	static struct mcux_lpadc_data mcux_lpadc_data_##n = { \
	ADC_CONTEXT_INIT_TIMER(mcux_lpadc_data_##n, ctx), \
	ADC_CONTEXT_INIT_LOCK(mcux_lpadc_data_##n, ctx), \
	ADC_CONTEXT_INIT_SYNC(mcux_lpadc_data_##n, ctx), \
	}; \
	\
	DEVICE_DT_INST_DEFINE(n, \
	&mcux_lpadc_init, NULL, &mcux_lpadc_data_##n, \
	&mcux_lpadc_config_##n, POST_KERNEL, \
	CONFIG_ADC_INIT_PRIORITY, \
	&mcux_lpadc_driver_api); \
	\
	static void mcux_lpadc_config_func_##n(const struct device *dev) \
	{ \
	IRQ_CONNECT(DT_INST_IRQN(n), \
	DT_INST_IRQ(n, priority), mcux_lpadc_isr, \
	DEVICE_DT_INST_GET(n), 0); \
	\
	irq_enable(DT_INST_IRQN(n)); \
	}

	DT_INST_FOREACH_STATUS_OKAY(LPADC_MCUX_INIT)